Upshaw, a Republican who had served in the state legislature since 2004 representing District 95, was discovered at the private residence of former state lawmaker Clint Rotenberry, in Mendenhall, Miss., more than 100 miles from her home near the Gulf Coast.

"I have known Jessica for many years as an unselfish and dedicated public servant. This is a tragic loss for her family and all Mississippians, and our thoughts and prayers go out to her family during this difficult time," Bryant said.

Upshaw's death marks the fifth time in as many months that a Mississippi lawmaker has passed away, although the other four died of natural causes.

"Once again this session, the House has been touched by tragedy," Mississippi House Speaker Philip Gunn, said in a statement. "Rep. Jessica Upshaw was an outstanding legislator and friend. She was one of the brightest and most competent members of the House."

Upshaw, a former attorney, was chairwoman of the Conservation and Natural Resources Committee in the Mississippi House of Representatives.